Pinanga lepidota (Arecaceae: Arecoideae), a new record for ...asbp.org.ph/wp-content/uploads/2020/11/PJSB_2020-005.pdfNotes: The first specimens of this species collected in Palawan

PRIMARY RESEARCH PAPER | Philippine Journal of Systematic Biology

DOI 10.26757/pjsb2020c14005

Volume 14 Issue 3 - 2020 | 1 © Association of Systematic Biologists of the Philippines

Pinanga lepidota (Arecaceae: Arecoideae), a new record for

the Philippines from Palawan Island

Abstract

Pinanga lepidota (Arecaceae), previously known only from Borneo, is reported here as a new record for the Philippines

from Palawan Island. A key to the identification of similar species of Pinanga in the Philippines is provided, including

brief notes on Bornean Arecaceae elements in Palawan.

Keywords: Mt Mantalingahan, Palmae, palms, Pinanga

1Department of Forest Biological Sciences, College of Forestry and

Natural Resources, University of the Philippines - Los Baños, College,

4031 Laguna, Philippines; 2Graduate School, University of the Philippines - Los Baños, College,

4031 Laguna, Philippines 3Plant Biology Division, Institute of Biological Sciences, College of

Arts and Sciences, University of the Philippines - Los Baños, College,

4031 Laguna, Philippines 4Museum of Natural History, University of the Philippines - Los

Baños, College, 4031 Laguna, Philippines 5Institute of Biology, College of Science, University of the Philippines

- Diliman, 1101 Quezon City, Philippines

*Corresponding email: [email protected]

Date Submitted: 16 June 2020

Date Accepted: 11 September 2020

Introduction

Pinanga Blume includes acaulescent or erect, diminutive

or robust forest undergrowth palms that occur from sea level up

to ca. 2800 m elevation (Dransfield et al. 2008). The genus

name is the Latinized form of the Malay vernacular name

pinang, often applied to the betel nut palm, Areca catechu L.,

and various other species of the genera Areca L., Pinanga, and

Nenga H.Wendl. & Drude (Dransfield et al. 2008). Pinanga

occurs in tropical and subtropical Asia to the northwest Pacific,

from the Himalayas and south China to New Guinea (Dransfield

et al. 2008, Govaerts et al. 2020). Currently, there are about 142

species in the genus (Govaerts et al. 2020), with the greatest

diversity occurring west of Wallace’s Line. At least 40 species

occur in Borneo, 26 species in Malay Peninsula, only seven

species in Sulawesi, and just one species at its eastern limit in

New Guinea (Govaerts et al. 2020). In the Philippines, 20

species were earlier listed by Beccari (1919) and Merrill (1922);

six species have since been added to this list (Fernando 1988,

1994, Adorador et al. 2020).

Our continuing studies on the palms of the Philippine

Islands have revealed the presence of Pinanga lepidota Rendle

on the lower slopes of Mt Mantalingahan near the southern end

of Palawan Island, approximately 220 km from Sabah on the

northeastern tip of Borneo. There is just one other species of

Pinanga, P. curranii Becc., that occurs in Palawan (Fernando

1988, 1990a). Pinanga lepidota, thus becomes only the second

species of Pinanga in Palawan, bringing to a total of 27 species

for the whole Philippines.

Pinanga lepidota is a beautiful slender, clustering palm

first described by Alfred Barton Rendle (1901) based on a

specimen collected by Charles Hose in April 1895 in the Baram

District of Sarawak, Borneo. Outside of Sarawak, this species

has also been collected and recorded in other northern parts of

Borneo (Dransfield 1980b), e.g. Brunei, Sabah, and Kalimantan

Timur.

Materials and Methods

In January 2020 during a botanical survey on Mt

Mantalingahan in the south of Palawan Island, Philippines, we

documented and collected a diminutive, clustering undergrowth

species of Pinanga. We subsequently compared our field notes

and specimen collection with herbarium specimens at Philippine

herbaria, namely, LBC, PNH, and PUH and reviewed relevant

literature. On determining the collection to be that of Pinanga

lepidota Rendle, hitherto known only from Borneo, we then

examined an isotype of this species at PNH and digital image of

Edwino S. Fernando1,4,5, Eugene L.R. Logatoc2, Pastor L. Malabrigo Jr.1,4, and Jiro T. Adorador3

Volume 14 Issue 3 - 2020 | 2 Philippine Journal of Systematic Biology Online ISSN: 2508-0342

Fernando et al.: Pinanga lepidota, a new record for the Philippines

the holotype at BM, and other specimens at K, L, and NY for

comparison. Herbarium acronyms follow Thiers (2018–

continuously updated). Here we present our account of the

occurrence of this species in Palawan, including a diagnostic

description, and a key to the identification of similar species of

Pinanga in the Philippines. We also provide brief notes on

Bornean palm elements in Palawan.

Taxonomic Treatment

Pinanga lepidota Rendle, J. Bot. 39: 177 (1901); Merrill, Bibl.

Enum. Bornean Plts. 84 (1921); Dransfield, Kew Bull. 34: 774

(1980). Figs. 1–2.

Type: BORNEO, Sarawak, Baram, April 1895, C. Hose

702 (holotype BM [BM001040833], image seen; isotype PNH!

[PNH-32211]).

Pinanga baramensis Furtado, Feddes Repert. 35: 277

(1934). Type: BORNEO, Sarawak, Baram, J. Hewitt s.n. in

Sept. 1907 (holotype K [K000207915], image seen).

Pinanga barramensis Becc. ex Martelli, Atti Soc. Tosc.

Sci. Nat. Res. Pisa. Mem. 44: 124 (1934). Type: BORNEO,

Sarawak, Baram, 20 July 1908, F.W. Foxworthy 511 (lectotype

FI, n.v.; isolectotype PNH! [PNH-26144]).

Slender, clustering, pleonanthic, undergrowth palm, to 1.5

m tall. Stems to ca. 1 cm diam.; internodes ca. 5–10 cm

long; crownshaft elongate, tubular, 27–40 cm long. Leaves to 5

in crown; leaf sheath 15 cm long, covered with reddish-brown

scaly indumentum; petiole up to 16 cm long; lamina sometimes

entire, except for deep apical split, inversely sagittate and bifid,

or segmented up to 64 cm long and 24 cm at its widest point

near the apex, the adaxial surface of lamina often glossy, the

abaxial side paler, leaf segments asymmetrical, up to 2 on each

side of the rachis, basal segments 4–6-costate, up to 21 × 5.8

cm, apical segments 9–10-costate, 24 cm long (mid-section to

apex), fused up to 16 cm at the base. Inflorescence infrafoliar,

an unbranched, simple spadix, ca. 7–8 cm long, often erect;

staminate and pistillate flowers not known. Fruits ovoid, 10–12

mm long, 4–5 mm wide, light yellow to yellow orange

throughout, arranged distichously along the rachilla, up to 9 mm

apart, fruiting perianth 5 × 3 mm, slightly broadened at the

mouth.

Distribution, habitat, and ecology: This species is known

from Borneo (Sarawak, Sabah, Brunei, and Kalimantan Timur)

and the Philippines (Palawan). In Borneo, it has been recorded

up to 1500 m elevation on various types of habitats, including

hill dipterocarp, lower montane, ultramafic, and heath forests

(see representative Bornean specimens examined). The habitat

on Mt Mantalingahan in Palawan where Pinanga lepidota was

discovered was at ca. 600 m elevation in a dipterocarp forest

with canopy of 20–25 m and tree emergents to 35 m tall. The

species is rather uncommon in the area. The mottled-leaved P.

curranii also occurs here, including Areca vidaliana Becc.,

Orania paraguanensis Becc. and several species of rattans.

Vernacular name: Písa-písa. This vernacular name is also

applied to Areca vidaliana.

Specimens examined: PHILIPPINES. Palawan Island,

Municipality of Rizal, Mt Mantalingahan (west side), Barangay

Ransang, Sitio Balen-balen, Baluing, 8°48’ 45.72” N, 117°

36’08.1” E, dipterocarp forest, 610 m elev., 20 June 2007, N.A.

Bartolome 4965 (PUH!), along trail from Baluing to Kebgen,

ca. 600 m elev., 10 January 2020, E.L.R. Logatoc 20-0156

(LBC!).

Representative Bornean specimens examined for

comparison: SARAWAK: Baram District, April 1895, C. Hose

702 (holotype BM [BM001040833] image seen; isotype PNH!

[PNH-32211]), Sept 1907, J. Hewitt s.n. (K [K000207915]),

image seen, holotype of Pinanga baramensis Furtado],

Claudetown, Baram, 20 July 1908, F.W. Foxworthy 511 (PNH!

[PNH-26144], isotype of Pinanga barramensis Becc. ex

Martelli); Narudi Forest Reserve, ca. 152 m elev., 05 Feb 1966,

W.L. Chew 979 (L [L0616044], image seen); Bukit Penarih,

Balingian, heath forest, 10 m elev., 18 Oct 1963, P.S. Ashton

S.19443 (L [L0616049], image seen); 4th Division, Gunung

Mulu National Park, between Sg. Medalam and Lobang Cina,

kerangas forest, 100 m elev., 15 Oct 1977, J. Dransfield 5335 (L

[L0616042], image seen); 5th Division, Gunung Pagon,

Limbang, sub-montane mossy forest, 1500 m elev., 15 Aug

1984, D. Awa & B. Lee S.47890 (NY [NY02325892], image

seen). BRUNEI: Temburong, NE of Gunung Retak, 1125 m

elev., 10 March 1991, R.J. Johns 6591 (L [L0616051], image

seen); Batu Melintang to Batu Patam, near the Sarawak border,

1–180 m elev., 03 Jan 1989, E.F. De Vogel 8876 (L [L1407869],

image seen). SABAH: Penampang District, Crocker Range,

montane dipterocarp forest, 1000–1050 m elev., 18 March 1984,

J.H. Beaman 8970 (L [L0616065], image seen); Ranau District,

Bukit Ampuan, ridgetop, hill dipterocarp forest on ultrabasic

rock, 700 m elev., 31 Aug 1979, J. Dransfield et al. 5581 (L

[L0616040], image seen); Kinabalu, Penibukan, 1000 m elev.,

12 March 1970, H.P. Nooteboom & Aban 1571 (L [L1407885],

image seen). KALIMANTAN TIMUR: Between Long Bawan

and Panado, hill forest on sandstone, 1400 m elev., 09 July

1981, R. Geesink 8996 (L [L1407902], image seen).



Notes: The first specimens of this species collected in

Palawan were from Mt Mantalingahan at 610 m elevation by

Mr Nestor A. Bartolome (Fig. 1) during a botanical survey in

June 2007 by Conservation International – Philippines as part of

a preparatory phase towards formal declaration of the mountain

as a protected area in 2009 (Matias & Tabangay 2014). Our

recent collection of this species was from the same mountain at

nearly the same elevation (Fig. 2). Although the type specimen

(C. Hose 702, BM001040833) from Borneo has leaves with a

large entire terminal portion and two small basal leaflets, leaf

dissection in this species is regarded as variable, and in Borneo

can range from entire leaves to leaves with 3–4 leaf segments

on each side of the rachis (Dransfield 1980b). The isotype

material in PNH (PNH-32211) has two leaves, each with two

segments on each side of the rachis. Pinanga lepidota in

Palawan also shows both entire and dissected leaves (Figs. 1–2).

The tallest stems among a clump produce leaves with up to just

two leaf segments, while leaves near the base are typically

entire-bifid (Fig. 1A). Fruits of the collection from Palawan

(E.L.R. Logatoc 20-156) have yellow, broad-conical apex (Fig.

2C) which is slightly different from Bornean specimens that

typically have fruits with greenish narrow-conical apex.

Among the Philippine species of Pinanga, P. lepidota

belongs in the ‘Modesta group’ (Adorador et al. 2020)

characterized by solitary or clustering habit, slender stems,

often less than 2 cm thick, where it can be identified close to

Pinanga geonomiformis Becc. using the modified key below.

Key to species of the Modesta group of Philippine Pinanga

1 Stem habit solitary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

- Stem habit clustering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Leaflets grayish-brown underneath when dried, rachillae few

(rarely more than 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . P. egregia Fernando (Luzon, Polillo)

- Leaflets reddish-brown underneath when dried, rachillae much

more (mostly more than 4). . . . . . . P. isabelensis Becc. (Luzon)

3 Floral triads arranged in 3-series along rachillae . . . . . . . . . . . .

. . . . . . . . . . P. heterophylla Becc. (Luzon, Rapu-Rapu, Negros)

- Floral triads arranged distichously along rachillae . . . . . . . . . .4

4 Leaflets with whitish indumentum abaxially, fruits set much

further apart along rachillae (to 1.5 cm) . . . . . . . . . . . . . . . . . . .

Figure 1. Herbarium specimens of Pinanga lepidota collected from Mt

Mantalingahan, Palawan, 20 June 2007, N.A. Bartolome 4965 (PUH).

A Specimen showing dissected leaves; B Simple, unbranched spadix.

Scale bars A = 4 cm; B = 1.5 cm. Photos by Leonard L. Co

Figure 2. Pinanga lepidota at ca. 600 m elevation on Mt

Mantalingahan, Palawan. A Juvenile plants with mostly entire leaves;

B Plants with prominent slender stems and dissected leaves; C

Infructescence with nearly mature fruits. E.L.R. Logatoc 20-0156

(LBC). Scale bars A = 10 cm; B = 25 cm; C = 15 mm. Photos by

Eugene L.R. Logatoc



. . . . . . . . P. modesta Becc. (Bucas Grande, Mindanao, Basilan)

- Leaflets without whitish indumentum abaxially, fruits set

much closer along rachillae (typically to 0.5 cm) . . . . . . . . . . 5

5 Inflorescence much-branched, with 4‒9 rachillae . . . . . . . . .

. . . . . . . . . . . . P. gruezoi Adorador & Fernando (Samar,

Dinagat, Bucas Grande, Mindanao)

- Inflorescence spicate, with only 1 rachilla (very rarely more

than 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

6 Leaflets fresh-looking and herbaceous-textured, rachillae

longer (7‒14 cm long), fruit narrowly ovoid-ellipsoid attenuate

to the base and often slightly curved, ripening from green to

pink, then red to purplish red, fruiting perianth contracted at the

mouth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . P. geonomiformis Becc. (Luzon, Polillo, Mindoro)

- Leaflets dry-looking and tough-textured, rachillae shorter (up

to 8 cm long), fruit broadly ovoid, typically ripening from green

to yellow, fruiting perianth broadened at the mouth . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . .P. lepidota Rendle (Palawan)

Notes on Bornean Palm Elements in Palawan

The discovery of Pinanga lepidota on Palawan is not

completely unexpected as the island is, biogeographically, often

considered part of the Sunda continental shelf (Sundaland) and

may have had a mid-Pleistocene connection to Borneo (Heaney

1986, Piper et al. 2011, Brown et al. 2013). Bornean botanical

elements in Palawan were earlier noted by Merrill (1926a, b)

and later by Philipson (1979) for Polyscias borneensis Philipson

(Araliaceae), Wong (1998) for Dinochloa robusta S.Dransf.

(Poaceae), Atkins et al. (2001) for Cyrtandra J.R. & G.Forst.

(Gesneriaceae), and Hoffman et al. (2003) for Phyllanthus

balgooyi Petra Hoffm. & A.J.M.Baker (Phyllanthaceae). For

Arecaceae, there are 11 Bornean species, thus far, recorded in

Palawan (but not elsewhere in the Philippines) (Dransfield

1980a, 1981, Fernando 1990a, Pelser et al. 2011, Saw 2012,

Shahimi et al. 2019, Henderson 2020) viz.: Arenga brevipes

Becc., A. distincta Mogea, Calamus caesius Blume, C. longipes

Griff., C. marginatus (Blume) Mart. ex Walp., C.

melanochaetes (Blume) Miq., Caryota mitis Lour., Korthalsia

rigida Blume, K. robusta Blume, Licuala spinosa Wurmb, and

Oncosperma tigillarium (Jack) Ridl. In addition, A. vidaliana

occurs in Palawan and Balembangan Island (not strictly

Bornean, but part of Sabah territory) (Merrill 1926b, Dransfield

1984). With very similar distribution pattern like A. vidaliana,

Orania paraguanensis is in Palawan and Banguey Island, off

the coast of Sabah (Merrill 1926b, Keim & Dransfield 2012).

Calamus malawaliensis J.Dransf. is also found in Palawan and

Malawali Island, just south of Banguey (Fernando 1990a, Baja-

Lapis 2010). The genus Adonidia Becc. includes the newly

described A. dransfieldii K.M.Wong, J.B.Sugau, & Y.W.Low

from Sabah, Borneo (Wong et al. 2015) and A. merrillii (Becc.)

Becc. from Palawan and the small island of Danjugan near

Negros (Fernando 2011). There is yet one other Bornean palm,

Salacca ramosiana Mogea, shared with Palawan and also with

Tawi-Tawi (Mogea 1986, Fernando 1990a). However, there

remain at least four Bornean palm genera that have yet to be

found in Palawan (Kiew 1976, Dransfield 1982, Fernando 1983,

1990a), e.g. Eugeissona Griff., Iguanura Blume, Nenga

H.Wendl & Drude, and Plectocomiopsis Becc. Conversely,

Heterospathe Scheff., a genus predominantly of the western

Pacific and Papuasia, and now with 13 species in the Philippines

(Fernando 1990b, Fernando & Sotalbo 2001, Adorador 2019),

including one species, H. dransfieldii Fernando in Palawan, has

not been recorded yet in Borneo.

Acknowledgements

We thank Protected Area Superintendent Mildred Suza of

the Mt Mantalingahan Protected Landscape (MMPL), CENRO-

Quezon, and CENRO-Brooke’s Point for their assistance; F.

Escala III, B. Lumpon, R. Sendacan, and the local field guides

from Ransang and Aribungos for their help and companionship.

Permit to collect plant specimens for scientific research study

was covered by Gratuitous Permit No. 2019-25 issued by the

Palawan Council for Sustainable Development (PCSD). The

recent field work in the MMPL was supported by the Forest

Foundation Philippines (FFP) through the Pro-Seeds

Development Association, Inc. ESF is grateful to the late Mr

Leonardo L. Co for sharing his photos of herbarium specimen of

Pinanga lepidota from Mt Mantalingahan in 2007.

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Documents

Pinanga lepidota (Arecaceae: Arecoideae), a new record for ...asbp.org.ph/wp-content/uploads/2020/11/PJSB_2020-005.pdfNotes: The first specimens of this species collected in Palawan